Migrate to cargo_embargo. am: 1e28b52033

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/clap_lex/+/2826412

Change-Id: Id9731e4544af65b95a81d98670450f03f6f33432
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>